Hi, Just built a new system with these specs: P4 3.0 Prescott Intel D915PBL Motherboard 1024 gig Mushkin DDR2 PC-4200 533mhz RAM XFX Geforce 6600GT Video Super Lanboy case Thermaltake Silent775 HSF with Arctic Silver 5 applied I'm not really sure why Thermaltake decided to call this HS Silent. It's not. It's much louder than my old P4 2.2 w/stock heatsink and fan system. And I don't think the cooling is that great: CPU Idle: 44 - 46 CPU Load: 56 - 57 (tested with Sandra 2005) Case temp: 36 -38 Ambient Room Temps: 24 - 26 I was thinking of a new case for this system. Possibly the Thermaltake Shark case: http://www.newegg.com/Product/Product.asp?Item=N82E16811133144 But this has a more open design, and would probably be even louder. I was wondering if I could use a quieter fan for the Silent775 heatsink and still get the cooling from it.